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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2ff28ecced78bf893a2cd0d86b7ece74821bafa1209878c3390e83fedafc9a' 
  AND token = 'YnDyrrpCx1ESI3toUOK3Q5g/hSQECAWaUoq3MYtrS4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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