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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f8d136ccbb9e660c8461b22cffec7628a220589f192ae514bd2f4afa800cc0' 
  AND token = 'Ak58jA2RqwVEmhi9t6KjXAEiRTIAXZcLjdrlUXVTBcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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