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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31e97a5cf39c1d760432c6e59913617c37d900e294f4c3a846e6e50c0282def' 
  AND token = 'yAWVYAL1+Gn2Jolf7pLjdAMKa+KMaJVOAkT6Uys8Ygg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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