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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96f55ab4c7fde42b84e3bebf38ff3492995ca56f7098e7a7d47eb9207b3fbf6' 
  AND token = '+C+bMm6KjsTwgifXJQbS7MQR8g3vCcp5w0xMs9qP2HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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