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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eceb8e0de7367e94aea0edc624965e1cd039d2577f1b78955e6f0f96ecb2f19d' 
  AND token = 'A1JUBrWi3jOX/7DzQlhzJ/A3693jCLHz/QauIO+it3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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