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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031974c392f3c8f02079f56a729acf7a713891f6cec38d6b07000008c3fe1982' 
  AND token = 'O5j/preCUNOzzaam/Lpzfg4wxH1nIMl3BkRzZCrWZeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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