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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f80d0e092cc65d888ded0b9699bd4e6b3ec2b83c655dd6713aa7e33c3481698' 
  AND token = 'B9aEgLBBciPmXhA6GpfMbDoPZaI5JqI7PExSy0q8OpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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