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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1689628ff1a44c0991d0bd91857a9bfb944c6e0504fef04203d6102dbd8517' 
  AND token = 'GnJ3pfU7KCevI66ky5LAUCNArQPI0I8LeMa1vmxsEfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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