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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9e69085a00bef694ddaee6a4e6cb4daeb8417f4a4e5aa3ea475e0e0d6cc1d5' 
  AND token = 'Pfo+u0Yud/Vy1ySPpKY3dC1n/9zYBs7udUUN0j0ATbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}