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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f822b10ac5096ab8b98c11d4b0ecd999e57419ed45329b0379d20d548a89b7c3' 
  AND token = 'iaNWu7H50Sm7kKw13hLElVOE8ACZCCa3GZTQy9SKc30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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