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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f13d5b0bdfce75599df6812c01438811c7e006863b8eabf5d3627eef08f1dea' 
  AND token = 'BJ2yBp6PWYakm/NSjBKIKICzHgLr3moPTP+TosHfjdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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