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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844e82140a0fccb8a4873f457b8c7160af89c42e1bc20074f6fcc425489e98d1' 
  AND token = 'ygByqcchqv5RpnGL8T8R7zQUC+Sn2+Y3fFD0YV3pHK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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