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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901eb3a8980243f4c0be74247528711b4350a1cd454746316ec58311a34fc4fd' 
  AND token = 'PuiCbcz0iXeO2yyoxYRNsF8n/25cdCKyVxOisB6Kpwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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