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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38230cd497b82ee25970e7c3247922903e80a42f9fa9118a2c9664cb81bab3c' 
  AND token = '90pip4dXFzETscX/PB47AGdlJ1iMZcc/fL6DTA8erMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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