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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fe33fe6120f8c249d3cca0ce16ebc7ea30f1edb17c2a08209b49e0e5ce3c53' 
  AND token = 'tfWmzv05VQL9Y/gv/u2+OHmdP7Ym8F2cDUH+Eh0CLwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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