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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f64992fb63467a93bfa0286db3cf728bbce718450609e0c3f493825cec001f' 
  AND token = 'NdjVVGqB80daac+E/PHZwb4bypqUiqFeWcHuEHgfraA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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