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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81225d8ec0b7809ab7047d9d5c8602e0ccddc8062fce8ddda631876c3fbe309' 
  AND token = 'M20PqQGplh737tejg+YD8mV8C9s5euRBf01iAJX8+wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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