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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff12c678aadac5c709b6aa88b8f821b6ec39170717729221b1f907e8c72d21b2' 
  AND token = 'zV7iUocNalz2bIcovzIURym7YYmAOiMLWFrM8ejYFhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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