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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b0768675aa6607a8b3e3d1b50d10beec20b237f99575c8b25ef560830d3328' 
  AND token = 'SgJI4SvrbZJ/YD4Mdh3IAvs6WFEyI3+d7nRMQRrQsmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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