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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7e4a473290880338df416bc47b6a47ac1f7f96940f363be4446886533d848b' 
  AND token = 'eNGkDN5eHU8Q7eaGtS6uHsktqRDakpGaqWICTReht+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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