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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36c7cb292e52bdd5bccf42e0de63ddf0c4fcae11b6256912269fc23bafc2fbe' 
  AND token = 'q60eHn3iDaQDUMYC1h4K0et0N+EETs+rJbmY/lzNnJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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