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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b0712ce423aa7d21cd01916deca90323779d1949c544dd9f1e1f9b923b5480' 
  AND token = 'mbqvVG8Jj4zue0R3Amo06XLq2RdjiEpyvrvdC6x4Xx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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