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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4c532f520eb755e44eac7fcb2be9ccff634c7fe34a5caa65b6249c09707418' 
  AND token = 'Z2qbovd+sl+aLObzYh9M0xzMzOvoCDhT9iX3EFgKwBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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