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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7cbe08944453c1a2c00db7a28bc78efd5b5209434a5d98faf86d50ec3a59fa' 
  AND token = 'l/s2QthMJPdJw9Kh9+XsXhsWOIHVSE7Qg9ccqxQlaf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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