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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230d41fc56477daaf90bd54e26c523a7ac97b90338be0ed16d5f84dcfea62e50' 
  AND token = 'cuVfRmxOKpRn6aRIzz4coO+8kJngChYB93zYABn1d84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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