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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac2cc91e6efe64799517f7da2f70a2fbd6f74bba9fa127719735c46ac71ef68' 
  AND token = '0eTuYuUfr6JETuO6slvvdBBHRjRXdFwTqX4g32fkcIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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