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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd773a74892ad3a58e4638b3a1a4ea4b546d92cadf91061e2afc31baeeaf1ed80' 
  AND token = '4d9xdvg86rXLV9bgkVb4Uv4eV3bHhDUvd9lm1kseN+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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