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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82c9f0e2f2e090eaae659cd4c15052a8b375131623df23e231690eb59a0edb5' 
  AND token = '/FqfJftdXVZ7LTJP6hzTXRUDROo3U0RA5IdRMHmmmKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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