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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797afdac9620c997fa4d55e10180956d3a8bb3d42b9d2e1e3afd0a4cb88df015' 
  AND token = 'PvsPycu46jDP9ThCcXSrWzGu32pdiVEGM3pOdHY/2JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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