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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9215e1f95b9fabd76c11aa67df99fe7d7dfa54ab710ba72e82a715d6fda60c6f' 
  AND token = 'Xm5w5ehYfei7ofL85UanCfE8hshDRtIvQYhSUcnD78g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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