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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718a9907e1b67ffa1fc96f5d59d96ea55f6f24774ffe8ef928ceb95f4d0cb4b8' 
  AND token = '4yT+O8ILM1opD6SqgyM4yphwQcJ3OT4HM0hlRIiemng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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