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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8472dc6a0ba79198d22e462655f3e4c88b5468f70fb356694aedecfab1802c87' 
  AND token = 'Fo6cHFvAfkXEODXABCdt9x6dCXATysSLz7jBLat3fbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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