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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980809fbff1ddefc6bfacc90a7c8aa873af776abcfd3035e18587d7f6c330ab9' 
  AND token = 'fRPQdDR0tPZ3duIHxoXYZYv+J+UKsq7oEW6LyJddY60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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