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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe369b76003559960c06cbcd8685f210bc546d3555b5d8239c2e078585fc8ce' 
  AND token = 'mMeo+SpB9U08HTIVo/HwlzdToopjLTek0wxE2au1E+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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