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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ee2ca3309631b3172db43294d946e3b7daf240cc4888424b89527aef45390c' 
  AND token = 'NqE3H46Z6lDCMXGy4dhqD8T6TfsdrG1RzsMazhP7GAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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