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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b024f39e44e4e161e70df3da81c6f6f9943d8426a099bbfbfbca5519b01db2f' 
  AND token = 'HshIiGiHzkqkuIR2M34zpjvaYhtZ1lEumhqGV4xl9Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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