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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936acbbdc7411b048613790c1ae783b498cf5dce3bd1354ef7cabfcd39229d7e' 
  AND token = 'zjGAh4eInWBVC5oA5Hs8O9oRA56FIP3EEtaVHNXgIYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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