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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff67f907a8db38ed51003d0f3413ffd47a2e590bae812ba4e8312bc55c43e38' 
  AND token = 'boMEcZypQ1HPJOhcC29A41YrtIv9OdK9Kylk4Yes1Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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