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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2358514a64aa7d7f36488621124fac6af90a03d1e2bd5849daed97f5063b08b2' 
  AND token = 'QCcJA2ijlyX2/atZOACXifMZ6wqOvS9cTfrZHNd5kQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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