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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93836d85b74db83141610b5a50698ee7e0bde74e913044a723588d4f60707e3' 
  AND token = 'sLb9KevQDjDBInJ97i9BE6h5J7zxrL7PBrsMSl0bKzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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