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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b2a19c11fa38b46dce8e44bf58dee80b7e23d55218329da7b97a89eb986814' 
  AND token = 'OYvYJ3bcC4HIgQoVw2g0ISfo6FAIzq383p/n4mvGReY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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