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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47830f7a9f8feebc6b4864b9b8b33434f0043e0c3266d0a4499c4cb3375d1ab8' 
  AND token = 'm8006x35+43/iHhfJBOG+C+DhIMHMMWUTyuDXLsT3W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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