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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44371c860c50c8b9196f451a81430b24c026be0f141d354844847e0485a3b1fa' 
  AND token = 'EHjoDgH7xlrWhx3Ndf5Icv7LFL6QiEbiTnqrNVXrQz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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