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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658aa9d9c84a4628df16eb24986994afb64dac06168a4e246207fb179584e893' 
  AND token = 'qmG7O/9cOQNJ0qFGlgiO2jLkb959HnxK3bdRUDJbsY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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