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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb334469e7d167952d40d17e02ca1025cb47463361d7fcf81239d3b7513ccd0' 
  AND token = 'Bsc9LfkNgHECzChfUnGP9zGOB3Wx5fbi8InNbvb8Kmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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