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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ef0e8a2acf529674877c584b7dfc919f36ee8517ad4ff5abddb42c551eb3ed' 
  AND token = 'l6RZEAoA9hulelmuAaLJ9naZvxKbPmedSjMqW8acjBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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