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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077ec456922e24906d8bd29a99b85239acdc55cf2e6a4b71eafc4f5bf2382820' 
  AND token = 'rlfMafugj1+ei8fYxBqV9p5Sd0h4yDn94LzsNq0lPB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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