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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759c3e52b5b9e662d2d6e2c45b5ad554b8c4bc54273d23b0694ff1b60ed559a5' 
  AND token = '0/MVq0DIuPXPWiPA2MNlfidb0yUBizYH1q4uwJRgyj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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