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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c0151e5fe082b3065e301591bb727d9167c3fdb0b892a12837ba3ce1fa9bde' 
  AND token = '+i+CSt3xK+EEKUb3k70qn0cPuEAx2qxdnQZy0xPTFYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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