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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e21530443b76288055bdb09c93cf3cb98bdfdc94d4f892c455dc491c24367a' 
  AND token = 'BpT36nN51PjFLlkaA/464klc4nMC+1Zx+Kpwur2xHTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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