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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6ac349778eb24ced11afcb76b2703be6caa1d215fe4ca80422b31d040c42a3' 
  AND token = 'tDtQ/CUQh+yXPl86e7L4YBkatOybHdUAddSgUTdrmNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00346

JSON explain

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