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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0861efaaa7b3abd27ab07bba3811b1db8b1d67d401bca5fea66689a2b7340986' 
  AND token = 'I++44g6GzDKzazAxDcUD9YqbJ5ERkFYKhvW+Ii+MfsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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