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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e90ad3dd6c85e8cfbe4d89f88b9c3419e8af3718e2ae2be59035dd6c556cd9' 
  AND token = 's5EYLY1rbi3Qe9yd4WkOF8ajq6iTnRkEWidh90xMBAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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