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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613052bd5a9f9051a6922f99acc2e64d15099a287300118194b2ef11dcc426e8' 
  AND token = 'jLHX/pfEoNyWL0UQaur93+D+HUGJuUt7BbCNWoFlF4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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