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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840dcb74d1dbb17094192086f5db7f55fb5a7bca8c0aea7e4588264ce60f7713' 
  AND token = 'bh1x9DBrPPoroPQU5xLGQuDgzg1Fdiv20gK1EdOaEG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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