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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d9028180f0738c67343961cf63b202c892a21373362b417a7a8274769bd743' 
  AND token = 'mDa7gT/YLlhg3tax+bk7XQ0yRFjHGwrLKw+LUNAoBlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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