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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c39f7e6b62760d69e30e3356baa13b1aa58e6cdacb69eb745c08bb4363dba9' 
  AND token = 'T4qZ/umwBvKtbykvjYN3LFOeYv1kM47F38uOURzTsTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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