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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690d74d8cc79b84a9ed875f9113913cef11a9d1e0e0299a8ae89ab5375645748' 
  AND token = '15MdjcFRZ9KCokdiA2M7rqFa43fLWAvKJq8qa4TlNZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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