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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadc8c3d6dc60481ea695e08ecc0449f0a0e3ab84b64ce285c2e2d40790e7f6f' 
  AND token = '1mvJReK1+gycBfejt6lPh2A69ghnkbGBnKmKHp/k2w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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