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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a76a30db2438bd145c7f0d207d238f469b165dc4cfca8fb650dbe788d15c9cc' 
  AND token = 'JdGKMRVAcJy3NskQ9ptpIBjTAUo/witfO9Mvo09j/N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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