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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cba443abd2c44483041be4d4d9bbb71a506c9081ff925f945f6785f785a9e4a' 
  AND token = '3Bosbs/0WFeAwvm3su4QAfYnYNjmFT7QHEYSifjnUoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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