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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172b6cc82a35a305bfeea180a734aba4cb14bb53d5f2b9e9ef5ff2cb6e6f4aa5' 
  AND token = 'vzlkKLtWqvAVoqRltESLrtpJjf4ukI28z812hWGOBi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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