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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dec5e14fedf421b1bad6320ada70689f3e108ea1fedc6114d03a2e0ca9a4f34' 
  AND token = '1Xi2qLIkUynztfjasTpX0+V3Cax4tjpTgEhGMC4HvDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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