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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7903d8932960e45d823994a91aa2c2ff107c8e46ef5e0dc2e9cdd1c3d84f9f' 
  AND token = 'gViPHcaMfd0U0KOEOP1ZF3gOOikIydeok3VYjiXRzPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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