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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24adde67fc2d202a2c0e71692a8011c9d39d7933c5da51775ed2554d304740ff' 
  AND token = 'bfSBNhfaJu9hAJt3OzuAN7ovL0pgiSns6z3slwwaRQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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